Whitening knife for treating leather



June 24, 1930. H. w||

WHITENING KNIFE FOR TREATING LEATHER Filed Sept. 22, 1928 original special out, the rounded corners of the knife becoming sharp-edged by the reit becomes partly useless. After the whitenl v carried out without 40 Patented June 24, 1939. j I T f UNEE in:

HEINRICH WILL, or o sinenm 'mimusfGERMANY 1 xWHi'rENINe KNIFE FOR TREATING LEATHER:

Application filed." September 22, 1928, S.eria1 no. 30158 mas mmary 1938 I th treatment of leather and gloves whitening knives areused, generally consisting of a steel plate and having a cutting edge on one" edge; Ifthe cutting becomes-less good, itis necessary to give, to the cutting edge a hollow grinding several centimeters long in order to renew'the cutting capability.

The hollow grinding can be carried out only by skilled workmen,x'wher'eby the expenses connected with the use of 7 the whitening;

. knife are increased. Aqfurther inconvenience consists in that the hardness of the knife steel is reduced by the grinding so that the man, who uses the whitening knife must regrind it by hand on a whetting steel.

This regrinding is Very diflicult and "connected with a very considerable loss of working time. v The regrinding by hand is further connected withother inconveniences asthe whitening knife does notpreserve the grinding so that ithappens that the sharp edge'produced by the grinding cuts into the leatherat the whitening of thehide so that ing knives of known type have been used for a'longer time, the wear liasbecorne so great current expenses are further increased.

To avoid these nconveniences a whitening knife is created, according to the lnventlon,

ing of the whitening knife is'necessary, as by a thin steel blade, which is interchangeable,

' adjustable and provided {with double sided capability, thewhole working process can 'be out loss of time.

An'embodiment bfthii nventicn is illu s trated byway ofexample, inithe accompanying drawing, in which r dinal section. V g

The whitening knife "according: tothe in- 1 vention consists 'of a. base :plate 1 andof-a ily shifted.

that new knives have to be'u'sed,whereby the Y which avoids all the above mentioned inconveniences. N0 hollow grin'dlng and regrmde great expenses and with y ingcf thehide so that'this index cannot'slip cutting [plate 2 of thin steelsupp'ortedi by.

said tarsus;rqrhrtuas .bn er121i adapted to be uniformlysand easily shifted forward" and] backward. by means-f of the thumbs ofithe hand placed into the indentations 3' in the clamping -lid 4 so that. said cutting blade can be adjusted accurately, in

portions of' the surface of the cutting. blade 2, which are free owingto'the indentati0r1S;3,

may b r ughenedsq that a; "go hdldis d' d" rk h thumb.points at the shifting ,Of the cuttingblade. r I

cordan'ce with the cut to. be carried out. The i 7 On the surface of the clamping lid face a ing the cutting blade 3 a blade spring 5 is arranged designed to liftthe clamping lid off the cutting blade if the clamping nut-6 on the clamping screw 7 has been slightly un- I i I screwed so that the cutting bladeican be 'read- The clamping V rear end by a hingeS to the base plate '1.

blade is connected at the After the cutting blade has been adjusted tothe cut to'be carried out, the nut 6 is tightened so that the cuttingblade is securely. f

clamping lid. The cutting blade is fixed so that it cannot move between the base plate? clamped between the base-platefiand the and theclamping lid.

The front end of the base plate 1 is bev- 1 so ting end,"in order that the cutting blade be g strongly/tightened and adjusted in downelled; from the clamping screw 7 to the cut ward direction tothe out towards the surfaces of the leather to be treated.

TOn v he upper surface of. the clamping lid 4 aplate 9 upwardly curved at its free end is arranged, designed toserve as supportfor the indeX of the hand whichexerts the main pressure onto. the apparatus at the whitenfinger finds a comfortable support and can notbe injured.

'I claim;z'

1. A whitening knife comprising in cont.

bination abaseplate, a -clampinglid and;

the steel blade; 'a'blade spring on the 10wer'i plate and the clamping lid, a hinge fixing said clamping lid on said base plate.

3.7 A whitening knife as specified' in claim 1 1, comprising in combination'abase plate, 2

a handle of said base plate, a 'clamping lid V "m hingedly mounted on said baseplate, and

f "lid and' roughened on the portions, of its up-' 15 persurface under said indentations of said curved supporting plate for the index on ,[base plate designedto hold and protcct the 1 5 In testiinony whereof I 'alfix my signatnre.

f sh

' to" a 1 having an indentation inwardly extending from each side edge, and a steel blade clamped .s between said base plate and said clamping clamping lid, V I v p Awhitening knife as specified in claim '1, comprising i i-"combination with the base plate andithe' clampingflid, an upwardly V the uppe surface of said clamping li-dfand a protecting shieldon the rear end of said middle finger.

i V YHEINRIOH WILL; 

